mesomorphic

adj. having a strong and muscular body structure (Psychology); pertaining to an intermediate state (Physical Chemistry)

The three somatotypes—endomorphic, mesomorphic, and ectomorphic—are basic classifications of animal body types according to the prominence of different basic tissues types, roughly: digestive, muscular, and nervous tissues. They form the core of a theory, developed in the 1940s by American psychologist William Sheldon, associating body types with human temperament types. This linkage is fairly simplistic and is seen as outdated in physiological science, but the account of somatotypes is still probably a valid, if limited way to sort basic body types.
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Adjective
1. having a robust muscular body-build characterized by predominance of structures (bone and muscle and connective tissue) developed from the embryonic mesodermal layer
(synonym) muscular
(antonym) ectomorphic
(similar) athletic
(classification) anatomy, general anatomy

Being big-boned and muscular

mesomorphic
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